Interview Yatra

Top 20 Java Interview Questions and Answers for Freshers (2025 Edition) Preparing for your first Java interview can feel overwhelming. To help you, we’ve compiled the top 20 most frequently asked Java interview questions with expanded answers. These cover core concepts and practical knowledge that every fresher should be confident about. Part 1: Core Java Basics 1. What is Java? Java is a high-level, object-oriented, platform-independent programming language developed by Sun Microsystems (now owned by Oracle). Its key philosophy is “write once, run anywhere,” meaning code compiled into bytecode can run on any system that has the Java Virtual Machine (JVM). Java is widely used for web applications, enterprise systems, Android development, and cloud solutions because of its scalability, security, and community support. 2. What are the main features of Java? Java provides several powerful features: Platform Independence: Programs run across operating systems without recompilation. ...

🟡 Top 15 Java Interview Questions for 1–2 Years Experience If you're a Java developer with 1–2 years of experience, companies like TCS, Infosys, Capgemini, and Cognizant expect you to know Core Java, OOPs, Collections, and basic project-level concepts. Below are 15 most frequently asked questions with easy-to-remember answers. Q1. What is the difference between JDK, JRE, and JVM? ✅  JVM (Java Virtual Machine) Definition:  JVM is a virtual runtime environment that executes Java bytecode. Function:  It converts bytecode (.class files) into machine-specific code, making Java platform-independent ("write once, run anywhere"). Key Point: JVM doesn't understand .java files; it runs compiled .class files. Example: When you run a Java program using java MyClass , the JVM is what executes MyClass.class . ✅  JRE (Java Runtime Environment) Definition: JRE is a software package that contains JVM + core libraries + other components required to run Java applications. ...